AI SEO Glossary
Plain definitions of the terms behind AI SEO, from GEO and AEO to retrieval, citation, and entity clarity. Search or jump by letter, and follow any term through to the full guide.
26 terms
A
- AI crawler
A bot that fetches pages to build an AI index or to answer a live query. Blocking one, on purpose or by accident, removes you from the answers it feeds.
Is your site blocking the AI crawlers that could cite you?- AI Mode
Google's fully conversational search experience, where a generated answer, not a list of links, is the primary result. A distinct surface to be cited in.
How to show up in Google AI Mode- AI Overview
Google's AI-written summary that can sit above the classic results for a query. It may answer the searcher outright, and being cited in it is a distinct outcome from ranking below it.
How do AI Overviews work?- AI SEO
The practice of getting a brand found, understood, and cited inside AI-generated answers, not only ranked in a list of links. It shares SEO's technical base but is judged on citation rather than position.
What is AI SEO? A clear definition for marketers- AI visibility
How present, accurate, and well-cited a brand is across AI answers. The AI-era counterpart to search visibility, measured on whether assistants name and describe you correctly.
What is AI visibility, and how do you measure it?- AI visibility score
A single figure that rolls up how often and how favourably assistants surface a brand across a set of test questions. Useful as a trend line, not as an absolute.
What is an AI visibility score, and is it worth tracking?- Answer engine optimizationAEO
Optimising so an answer engine names or cites you when it responds to a question directly. The near-synonym of GEO, framed around the answer rather than the generation.
What is answer engine optimization?- Answer-first content
Writing that leads with a direct, standalone answer before the context. It gives an assistant a passage it can quote without reconstructing your point from a whole article.
What makes content citable in AI answers
C
- Citation
A reference to your page inside an AI answer, whether as a named source, a link, or a mention. Citation is the AI-era equivalent of the click you used to win.
How to earn AI citations: getting cited in AI answers- Corroboration
Independent sources describing you the way you describe yourself. It is what moves a model from noting your claim to trusting it enough to repeat it.
How to earn AI citations: getting cited in AI answers
E
- E-E-A-TExperience, Expertise, Authoritativeness, Trust
The signals of credibility a source can carry. Assistants lean on the same signals when deciding whether a page is safe to cite on a given topic.
E-E-A-T for AI search: does author authority matter?- Entity
A distinct thing a model can identify and reason about, such as a company, person, or product. Being a clear, consistent entity is what lets an assistant place who you are.
Entity SEO: how search and AI understand you- Entity SEO
The work of making your brand an unambiguous entity across your site, your structured data, and third-party sources, so a model can identify you with confidence.
Entity SEO: how search and AI understand you- Extractability
How cleanly a self-contained answer can be lifted from your page into a response. Answer-first passages under clear headings are far easier to extract than buried prose.
What makes content citable in AI answers
G
- Generative engine optimizationGEO
Optimising to be one of the sources a generative system draws on when it writes an answer. The most common name for the discipline this handbook covers.
What is generative engine optimization?- Grounding
Tying a generated answer to retrieved sources rather than the model's memory. Grounded answers cite live pages, which is why retrievable, current content gets named.
How AI assistants decide which sources to cite
K
- Knowledge graph
A structured map of entities and the relationships between them. Consistent signals across the web feed it, and a clear place in it helps a model describe you accurately.
Entity SEO: how search and AI understand you
L
- Large language modelLLM
The kind of model behind ChatGPT, Gemini, and Claude. It predicts text, and when connected to live retrieval it can cite the web rather than rely only on training data.
LLM SEO: how to optimize for large language models- LLM SEO
The same work as AI SEO, named after the large language models doing the answering. A framing that stresses being retrievable and quotable by an LLM.
LLM SEO: how to optimize for large language models- llms.txt
A proposed plain-text file at a site's root that summarises its key content for language models. Cheap to add, still early in adoption, and not a substitute for being crawlable.
What is llms.txt, and do you need it?
P
- Prompt set
The fixed list of buyer questions you run through assistants on a schedule to measure visibility. Keeping it stable is what turns one-off checks into a comparable trend.
How to check whether your brand appears in ChatGPT and AI answers
Q
- Query fan-out
When an assistant breaks one prompt into several sub-questions and answers the cluster. Covering the whole cluster, not just the head query, is what keeps you in the response.
How to rank in Google AI Overviews
R
- Retrieval
The step where a system fetches candidate sources before writing an answer. If a crawler cannot reach and read your page, you are never in the retrieval set to begin with.
How AI assistants decide which sources to cite- Retrieval-augmented generationRAG
The pattern behind most cited answers: retrieve relevant sources, then generate a response grounded in them. It is why being retrievable matters as much as being good.
How AI assistants decide which sources to cite
S
- Schema markup
Structured data that labels what a page is about in a machine-readable form. It helps a model parse your content, though it does not by itself earn a citation.
Schema markup for AI: which types help